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Statement-I : In a meter-bridge experime...

Statement-I : In a meter-bridge experiment, null point for an unknown resistance is measured. Now, the unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by decreasing the value of the standard resistance.
Statement-2 : Resistance of a metal increases with increase in temperature.

A

Statement-I is true, Statement-2 is true, statement-2 is a correct explanation for statement- I.

B

Statement-I is true, statement-2 is true, statement-2 is not a correct explanation for statement- I.

C

Statement-1 is true, statement-2 is false.

D

Statement-1 is false, statement-2 is true.

Text Solution

Verified by Experts

The correct Answer is:
D
When the temperature of metal increases, its resistance increases.
Therefore statement-2 is correct
(Unknown resistance) (Standard resistance)

For a meter bridge when nill point N is obtained we get `X/l=S/(100-l)`
When the unknown resistance is put inside an enclosure, maintained at a high temperature, then X increases. To maintain the ratio of null point l should also increas. But if we want to keep the null point at the initial position (i.e., if we want no change in the value of l) there to maintain the ratio, S should be increased.
Therefore statement-1 is false.
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